Jarrow Suntheanine L-Theanine 100mg

Jarrow Formulas · Capsule · 100 mg

Price/day

€0.37

Dose

100 mg

Servings/pack

Pack price

€22.00

Transparency Index

8.4/10

Recommended Consistent effect on focus and calm — pairs well with coffee.

Rating breakdown

Evidence for ingredient 7.0/10

L-theanine reduces subjective stress in multiple RCTs.

Value for money 8.0/10

€0.37 per capsule is reasonable for a branded ingredient.

Product quality 9.0/10

Suntheanine guarantees 100% L-isomer purity.

Label honesty 9.0/10

Clearly labeled, no proprietary blends.

Third-party testing 8.0/10

COAs confirm purity and absence of D-isomers.

Product Description

Suntheanine is produced by fermentation in Japan. Jarrow’s capsules are vegan with only rice flour as carrier.

What We Like

Noticeable effect within 20 minutes
No sedation
Vegan capsules

What We’re Missing

Only 60 servings per bottle
Capsules can be slightly powdery

Usage Recommendation

1 capsule alongside coffee or during stressful situations. For sleep support, take 2 capsules in the evening.

Other L-Theanine products

Pure Encapsulations L-Theanine 200mg

8.3/10

Recommended

Nutricost L-Theanine 200 mg

7.7/10

Recommended

NOW Foods L-Theanine Double Strength 200mg

7.4/10

Recommended

Ingredient dossier

L-theanine promotes relaxed alertness via alpha-wave activation. Best evidence for caffeine synergy; moderate effects on stress markers. Alone, cognitive benefits are limited.

Read full dossier: L-Theanine →